vetkit.aspnet.config.viewstate-mac-off

ASP.NET ViewState MAC validation is disabled (enableViewStateMac="false"). Attackers can tamper with ViewState and, through deserialization, execute code on the server.

Last updated: 2026-11-01

Suite: Security

regex

ASP.NET ViewState MAC validation is disabled (enableViewStateMac="false"). Attackers can tamper with ViewState and, through deserialization, execute code on the server.

Category: SECURITY · Engine rule severity: ERROR

How to fix it

Remove enableViewStateMac="false"; ViewState MAC must always be enabled.

References

https://learn.microsoft.com/en-us/troubleshoot/developer/webapps/aspnet/development/viewstate-mac-validation

Source: packages/engine/rules/sast/config.yml.

Generated from shipped rule definitions at build time. Matching is a review signal, not proof of exploitability. “generic” denotes text matching, not complete language or framework coverage. Runtime configuration and available tools affect whether a rule runs.